<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<c:out value="欢迎测试你的第一个使用到JSTL的网页"/> 
<br >你使用的浏览器是:<br>
<c:out value="${header['User-Agent']}"/>
<c:set var="a" value="DavidO'Davies"/>
<br><c:out value="DavidO'Davies" escapeXml="true"/>
</body>
</html>